Copper-catalyzed selective difunctionalization of N-heteroarenes through a halogen atom transfer radical process
作者:Hui-Lin Fang、Qiu Sun、Rong Ye、Jing Sun、Ying Han、Chao-Guo Yan
DOI:10.1039/c9nj03471d
日期:——
A highly regioselective Cu-catalyzed difunctionalization of different N-heteroarene salts such as quinolinium and benzothiazolim salts was developed with ether and X− (X = Br, Cl) as the halogen source under mild conditions. This transformation involved the combination of oxidative coupling, selective free radical resonance and a copper-catalyzed halogen atom-transfer radical process. The regiochemistry
Nucleophilic trifluoromethylation of azinium salts with Zn(CF3)2·bpy
作者:Shitao Pan、Xiu Wang、Chuanfa Ni、Jinbo Hu
DOI:10.1016/j.tet.2021.132477
日期:2021.11
(Trifluoromethyl)zinc complexes have been widely used in metal-mediated trifluoromethylation reactions. However, direct nucleophilic addition with a (trifluoromethyl)zinc complex is rare. In this article, we describe an unprecedented trifluoromethylation of azinium salts using Zn(CF3)2·bpy as CF3 source, giving 1-(4-methoxybenzyl)-2-(trifluoromethyl)-1,2-dihydroquinolines as products. The latter species
Base-promoted aerobic oxidation of <i>N</i>-alkyl iminium salts derived from isoquinolines and related heterocycles
作者:Li-Gang Bai、Yue Zhou、Xin Zhuang、Liang Zhang、Jian Xue、Xiao-Long Lin、Tian Cai、Qun-Li Luo
DOI:10.1039/c9gc03629f
日期:——
scope, low cost, feasibility of scale up, wide availability of reagents, and green reaction conditions, this method shows great potential for preparing isoquinolones and related compounds. The method was applied for atom- and step-economical total synthesis of natural products such as norketoyobyrine.
A nitrogen-doped carbon supported nanocobalt catalyst was developed and successfully applied for the hydrogen-transfer coupling of quinolinium salts and tetrahydroquinoline compounds. The selective coupling of the C6 sites of tetrahydroquinolines (THQs) with the α sites of quinoline salts generated a series of 2-substituted N-alkyl-tetrahydroquinolines. This catalytic conversion method, which can be
Rhodium(I)-Catalyzed Annulation of Bicyclo[1.1.0]butyl-Substituted Dihydroquinolines and Dihydropyridines
作者:Matteo Borgini、Qi-Nan Huang、Pan-Pan Chen、Steven J. Geib、K. N. Houk、Peter Wipf
DOI:10.1021/jacs.4c04081
日期:2024.6.5
0]butane-containing compounds feature a unique chemical reactivity, trigger “strain-release” reaction cascades, and provide novel scaffolds with considerable utility in the drug discovery field. We report the synthesis of new bicyclo[1.1.0]butane-linked heterocycles by a nucleophilic addition of bicyclo[1.1.0]butyl anions to 8-isocyanatoquinoline, or, alternatively, iminium cations derived fromquinolines and pyridines
含双环[1.1.0]丁烷的化合物具有独特的化学反应性,可引发“应变释放”级联反应,并提供在药物发现领域具有相当实用性的新型支架。我们报道了通过双环[1.1.0]丁基阴离子与8-异氰酸喹啉或源自喹啉和吡啶的亚胺阳离子的亲核加成合成了新的双环[1.1.0]丁烷连接的杂环。所得双环[1.1.0]丁烷在铑(I)催化的环重排中以高区域选择性转化为前所未有的桥联杂环。添加/重排过程可容纳令人惊讶的大范围的官能团。随后对 1-亚甲基-5-氮杂环丙[ cd ]茚支架的脲、烯烃、环丙烷和苯胺部分进行化学和立体选择性合成转化,提供了几种额外的新杂环结构单元。反应途径的 X 射线结构验证的量子力学 DFT 计算表明铑类胡萝卜素和金属环丁烷物种的中间作用。